I've been trying to figure out how Amazon SQS knows to process messages in a specific order when they have the same group ID. For instance, I send a purchase message and an invoice message, both with customer 444 as the group ID. If the invoice message arrives at SQS before the purchase message, how does SQS know to wait for the purchase to be processed first? I keep getting vague answers and I'm feeling a bit lost here.
4 Answers
You could just read the documentation instead of relying on AI for this. It's a straightforward concept, and understanding how SQS queues work can save you time. Also, you can handle purchase and invoice processing separately if the timing isn’t critical.
Just a heads-up, if you send multiple messages, they might arrive out of order in SQS, but as long as they share the same group ID, SQS guarantees that they’ll be processed in the order they arrived. It’s all about those group IDs!
SQS processes messages within the same group ID in the order they were received. So even if your invoice arrives first, it doesn’t mean it will be processed first. It simply goes into its lane and waits for the purchase message to process first, following the order rules per group ID.
Check the AWS SQS FIFO documentation for a detailed explanation. It clarifies how messages are managed, particularly with group IDs that ensure order. Here’s a useful link: https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-fifo-queues.html.
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